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TMS320C6726BRFPA200 Datasheet(PDF) 51 Page - Texas Instruments

Part # TMS320C6726BRFPA200
Description  Floating-Point Digital Signal Processors
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS320C6726BRFPA200 Datasheet(HTML) 51 Page - Texas Instruments

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TMS320C6727B, TMS320C6726B, TMS320C6722B, TMS320C6720
Floating-Point Digital Signal Processors
www.ti.com
SPRS370E – SEPTEMBER 2006 – REVISED JULY 2008
Table 4-9. EMIF Asynchronous Interface Timing Requirements(1)(2)
NO.
MIN
MAX UNIT
Input setup time, read data valid on EM_D[31:0] before EM_CLK
28
tsu(EM_DV-EM_CLKH)A
5
ns
rising
29
th(EM_CLKH-EM_DIV)A
Input hold time, read data valid on EM_D[31:0] after EM_CLK rising
2
ns
30
tsu(EM_CLKH-EM_WAITV)A
Setup time, EM_WAIT valid before EM_CLK rising edge
5
ns
31
th(EM_CLKH-EM_WAITIV)A
Hold time, EM_WAIT valid after EM_CLK rising edge
0
ns
33
tw(EM_WAIT)A
Pulse width of EM_WAIT assertion and deassertion
2E + 5
ns
Delay from EM_WAIT sampled deasserted on EM_CLK rising to
34
td(EM_WAITD-HOLD)A
4E(3)
ns
beginning of HOLD phase
Setup before end of STROBE phase (if no extended wait states are
35
tsu(EM_WAITA-HOLD)A
inserted) by which EM_WAIT must be sampled asserted on
4E(3)
ns
EM_CLK rising in order to add extended wait states.(4)
(1)
E = SYSCLK3 (EM_CLK) period.
(2)
These parameters apply to memories selected by EM_CS[2] in both normal and NAND modes.
(3)
These parameters specify the number of EM_CLK cycles of latency between EM_WAIT being sampled at the device pin and the EMIF
entering the HOLD phase. However, the asynchronous setup (parameter 30) and hold time (parameter 31) around each EM_CLK edge
must also be met in order to ensure the EM_WAIT signal is correctly sampled.
(4)
In Figure 4-13, it appears that there are more than 4 EM_CLK cycles encompassed by parameter 35. However, EM_CLK cycles that are
part of the extended wait period should not be counted; the 4 EM_CLK requirement is to the start of where the HOLD phase would
begin if there were no extended wait cycles.
Table 4-10. EMIF Asynchronous Interface Switching Characteristics(1)
NO.
PARAMETER
MIN
MAX UNIT
100-MHz EMIF Frequency
10
1
tc(EM_CLK)
Cycle time, EMIF clock EM_CLK
ns
133-MHz EMIF Frequency
7.5
2
tw(EM_CLK)
Pulse width, high or low, EMIF clock EM_CLK
3
ns
17
tdis(EM_CLKH-EM_DHZ)S
Delay time, EM_CLK rising to EM_D[31:0] 3-stated
7.7
ns
18
tena(EM_CLKH-EM_DLZ)S
Output hold time, EM_CLK rising to EM_D[31:0] driving
1.15
ns
21
td(EM_CLKH-EM_CS2V)A
Delay time, from EM_CLK rising edge to EM_CS[2] valid
0
8
ns
22
td(EM_CLKH-EM_WE_DQMV)A
Delay time, EM_CLK rising to EM_WE_DQM[3:0] valid
0
8
ns
23
td(EM_CLKH-EM_AV)A
Delay time, EM_CLK rising to EM_A[12:0] and EM_BA[1:0] valid
0
8
ns
24
td(EM_CLKH-EM_DV)A
Delay time, EM_CLK rising to EM_D[31:0] valid
0
8
ns
25
td(EM_CLKH-EM_OEV)A
Delay time, EM_CLK rising to EM_OE valid
0
8
ns
26
td(EM_CLKH-EM_RW)A
Delay time, EM_CLK rising to EM_RW valid
0
8
ns
27
tdis(EM_CLKH-EM_DDIS)A
Delay time, EM_CLK rising to EM_D[31:0] 3-stated
0
8
ns
32
td(EM_CLKH-EM_WE)A
Delay time, EM_CLK rising to EM_WE valid
0
8
ns
(1)
These parameters apply to memories selected by EM_CS[2] in both normal and NAND modes.
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Peripheral and Electrical Specifications
51


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